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Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations

A reconciliation of the Company's asset retirement obligations for the six months ended June 30, 2019 is as follows (in thousands):

As of December 31, 2018
$
29,655

Liabilities incurred
2,347

Liabilities settled
(789
)
Disposition of properties (1)
(7,668
)
Accretion expense
771

Revisions to estimate
1,088

As of June 30, 2019
$
25,404

Less: Current asset retirement obligations
3,008

Long-term asset retirement obligations
$
22,396



(1)
See additional information regarding disposition of properties in Note 4.